html {
    height: 100%;
}

:root {
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --border-color: #e0e0e0;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --success-color: #16a34a;
    --error-color: #dc2626;
    --editor-bg: #1a1b20;
    --editor-text: #e7e9e9;
    --code-bg: #fff9c4;
    --panel-width: 350px;
    --header-height: 56px;
}

[data-theme="dark"] {
    --bg-primary: #1a1b20;
    --bg-secondary: #1f2732;
    --text-primary: #e7e9e9;
    --text-secondary: #aebec5;
    --border-color: #424b56;
    --accent-color: #60a5fa;
    --accent-hover: #3b82f6;
    --success-color: #22c55e;
    --error-color: #ef4444;
    --editor-bg: #111214;
    --editor-text: #d4d4d4;
    --code-bg: #383a40;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
}

/* App Container */
.app-container {
    display: grid;
    grid-template-columns: 1fr var(--panel-width);
    grid-template-rows: var(--header-height) 1fr;
    height: 100vh;
    gap: 16px;
    padding: 16px;
}

/* Options panel collapsed state */
.app-container[data-options-hidden] {
    grid-template-columns: 1fr;
}

.app-container[data-options-hidden] .options-panel {
    display: none;
}

/* Main content column: editor + diagram stacked */
.main-content {
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
}

/* Header */
.app-header {
    grid-column: 1 / -1;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 16px;
}

.app-title {
    font-weight: 600;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.app-title svg {
    width: 24px;
    height: 24px;
}

.github-link {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    margin-right: 16px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
}

.github-link:hover {
    color: var(--text-primary);
}

.github-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

#copy-svg,
#save-png {
    margin-right: 8px;
}

#toggle-options {
    margin-right: 8px;
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-primary);
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
}

.theme-toggle:hover {
    background: var(--bg-secondary);
}

/* Editor Area */
.editor-area {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    flex: 0 0 auto;
    min-height: 160px;
}

.editor-panel {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.editor-panel h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

#ace-editor {
    flex: 1 1 auto;
    min-height: 0;
    font-family: 'SF Mono', 'Fira Code', 'Monaco', monospace;
}

.resize-handle {
    flex: 0 0 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: row-resize;
    user-select: none;
    touch-action: none;
}

.resize-handle::before {
    content: '';
    width: 56px;
    height: 4px;
    border-radius: 999px;
    background: var(--border-color);
    transition: background 0.1s ease;
}

.resize-handle:hover::before,
.resize-handle:focus-visible::before {
    background: var(--accent-color);
}


/* Diagram Area */
.diagram-area {
    flex: 1 1 auto;
    min-height: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    cursor: grab;
}

.diagram-area.is-panning {
    cursor: grabbing;
}

body.is-resizing,
body.is-resizing * {
    cursor: row-resize !important;
    user-select: none;
}

#output {
    min-height: 200px;
    padding: 16px;
    transform-origin: 0 0;
    will-change: transform;
}

/* Diagram Navigation Controls */
.diagram-nav {
    position: absolute;
    bottom: 12px;
    right: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    z-index: 10;
    pointer-events: none;
}

.diagram-nav-btn {
    pointer-events: auto;
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.85;
    transition: opacity 0.1s ease, background 0.1s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.diagram-nav-btn:hover {
    opacity: 1;
    background: var(--bg-primary);
}

.diagram-nav-btn-label {
    width: auto;
    padding: 0 10px;
    font-size: 11px;
    font-weight: 500;
    height: 28px;
}

/* Options Panel */
.options-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    overflow-y: auto;
    min-height: 0;
}

.options-panel h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.options-panel h3 + h3,
.options-panel .option-item + h3 {
    margin-top: 16px;
}

/* Editor theme selector */
.theme-select {
    width: 100%;
    margin-top: 4px;
    padding: 5px 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
}

.theme-select:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* Example macro links */
.example-list {
    list-style: none;
    padding: 0;
    margin-top: 8px;
}

.example-list li {
    margin-bottom: 4px;
}

.example-list a {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 13px;
    font-family: 'SF Mono', 'Fira Code', monospace;
}

.example-list a:hover {
    text-decoration: underline;
}

.option-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 8px 0;
}

.option-item:last-child {
    padding-bottom: 0;
}

.option-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}


/* Buttons */
.btn {
    padding: 6px 12px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.1s ease;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-secondary {
    background: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--accent-color);
    color: white;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}


/* Info Section */
.info-section {
    margin-bottom: 16px;
    padding: 12px 16px;
    background: var(--code-bg);
    border-radius: 6px;
    font-size: 13px;
    color: var(--text-primary);
}

.info-section a {
    color: var(--accent-color);
}

/* Version Info */
.version-info {
    margin-top: 16px;
    font-size: 11px;
    color: var(--text-secondary);
    opacity: 0.7;
    font-family: 'SF Mono', 'Fira Code', monospace;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Responsive */
@media (max-width: 1200px) {
    .app-container {
        grid-template-columns: 1fr;
        grid-template-rows: var(--header-height) 1fr auto;
        height: auto;
        min-height: 100vh;
    }

    .main-content {
        min-height: 600px;
    }

    .editor-area {
        min-height: 140px;
    }

    .options-panel {
        height: auto;
        min-height: 0;
    }
}

/* Loading State */
.loading {
    opacity: 0.5;
    pointer-events: none;
}

.spin {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--error-color);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    z-index: 1000;
    animation: toast-in 0.2s ease, toast-out 0.3s ease 2.7s forwards;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

@keyframes toast-in {
    from { opacity: 0; transform: translateX(-50%) translateY(8px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes toast-out {
    from { opacity: 1; }
    to { opacity: 0; }
}

/* Error States */
.error-text {
    color: var(--error-color);
    font-family: 'SF Mono', 'Fira Code', monospace;
    white-space: pre-wrap;
    padding: 12px;
    background: rgba(220, 38, 38, 0.1);
    border-radius: 6px;
}

/* Legend */
.legend {
    margin-top: 16px;
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.legend h4 {
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.legend-item {
    display: flex;
    gap: 8px;
    margin-bottom: 4px;
    font-size: 12px;
    color: var(--text-primary);
}

/* Syntax Diagram Elements (fallback styling) */
svg.railroad,
svg rdl-diagram {
    border: none;
    margin: 0 auto;
}